Saw-setting machine.



E. JOHNSON. SAW SETTING MACHINE.

APPLIUATION HLBD DEo.11, 1911.

Patented June 18, 1912.

0., WASHINGTON. D. C.

Tl TED STATS PATENT OFFICE.

EDWARD JOHNSON, 0F HAWTHORN, PENNSYLVANIA, ASSIGNOR OF ONE-HALF T0 JOHN FINKBEINER, OF HAWTHORN, PENNSYLVANIA.

sAw-snr'riive MACHINE.

Specification of Letters Patent.

Patented June 18, 1912.

Application Ied December 11, 1911. Serial No. 665,032.

To all whom it mayV concern:

Be it known that I, EDWARD JOHNSON, a citizen of the United States, residing at Itlawthorn, in the county of Clarion and State of Pennsylvania, have invented certain new and useful Improvements in Saw- Setting Machines, of which the following is a specification.

The present invention relates to saw setting machines and is specially designed for use in setting the teeth of circular saws.

Among the prominent features of novelty and meritorious objects of the invention is the capability of adjustment of parts of the machine adapting it for use with differing sizes of circular saws; its simplicity of adjustment and operation; its durability, and its comparatively inexpensive cost of production.

The invention consists in certain novel features of construction and combinations and arrangements of parts as' hereinafter set forth and more distinctly pointed out in the appended claim which forms a part of this specification.

In the accompanying drawings I have illustrated one example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles.

Referring to the drawings in which like reference characters indicate similar parts throughout the views: Figure 1 is a plan view of the machine constructed according to the principles of the present invention, showing, in dotted lines, a portion of a circular saw. Fig. 2 is a side elevation of Fig. l, with parts broken away for purpose of clearer illustration. Fig. 3 is a sectional view on line 3-3 of Fig. 2.

In the preferred embodiment of the invention as illustrated in the drawings, the base plate 1 is of usual construction, and is formed with a dove-,tail groove 2, between the side bars 3, 3, and is also provided with perforated lugs 4, by means of which, and suitable fastening devices, the machine may he firmly held and supported while its functions are being performed.

Within the groove 2 of the base plate are adapted to be moved, and held, the two blocks 5 and 6. The former, block 5, is the saw support, and for the purpose of supporting a saw, as 7, indicated in dotted lines, the block is provided with a projeci tion or lug 8 on its upper surface over which the central perforation of the saw 1s passed, and about which the saw may be turned as on' a pivot. At one end, and upon its lower or under side, the block 5 is provided with a dovetail tongue 9, complementary to the groove 2 and slidable therein. In addition to the tongue 9, for holding the block 5 in place I utilize the bolt 10, which is passed through a perforation in the extension 11 of the block 5, and fashioned with a head 12, which as clearly seen in Fig. 3 is complementary to the'slot or groove 2 and fits neatly therein. From this description it will be apparent that the block 5 may be moved along the base plate and is guided by the tongue 9 and head 12 in the groove 2, and when moved to adjusted position, the block may be there held by means of the nut 13. The anvil block 6 is also provided with a dovetail tongue, as 14, clamping bolt 15 with its specially shaped head 1G and clamping nut 17, similar to the pivot block 5.

The upper portion of the block 6 is bored out for the reception of a bolt or anvil 18, which is preferably cylindrical in cross section and held in the bore of the block by a pin or key 19, passed through a transverse opening in the block and engaging a groove in the anvil. The upper face of the anvil 1S is of conical formation as indicated at 2O to receive the swaged tooth of the saw, and in order that the latter may be trued thereon.

The setting tool comprises a shank 21 fashioned with the head 22 and the reduced extension 23 about which is coiled the spring 24. The shank, extension and spring are incased within the cylindrical recess or bore 25 of the block, and this bore is counterbored as at 26 for the reception of the eXtension. A recess or groove 21a is formed in the shank 21 in which is located a portion of the pin or key 19. The engagement of the pin in the groove or recess prevents rotation of the tool, and also holds the tool against outward pressure of the spring. A pair of chambers or recesses are provided 'in the head, one extending downwardly and the other upwardly from the upper and lower surfaces respectively of the head, and in these recesses are seated the hammer-bolt 27 and the setting-bolt 28, the latter of which is formed with a beveled bottom 29 complementary to the conical top 20 of the anvil 18. A pin is conveniently positioned to secure both the bolts 27 and 28 within the head 22, in manner similar to locking thel anvil 18.

When it is desired to set the teeth of a saw, the saw is placed upon the supporting block 5 with the lug 8 projecting through the central perforation ofthe saw, and the teeth of the saw located between the anvil and setting bolt,- as shown in dot-ted lines Fig. 2. lVith Y.the parts in this position, a blow from a hammer or other tool upon the hammer bolt 27, imparts a blow to the tooth upon the anvil through the medium of the setting tool and its setting bolt 28, and in this manner the tooth is set to proper position. The saw is now turned on the lug 8 as its pivot until the next tooth is centered under the setting bolt z'. e. the next tooth to be bent downwardly, and the operation is repeated. AfterY the teeth are set at one side ofthe saw, the saw is turned over and the teeth set on the opposite side as usual. The spring 24 acts as a cushion to take up the shock of the blow of the hammer, and to return the tool to normal position.

To adjust the machine for differing sizes of saws, the two blocks may be moved along on the base plate and secured in position by means of the clamping nuts 13 and 17. It will be noted that the members-18, 27, and 28 may be taken out and replaced, whenever desirable, to provide against wear, and breakage, and also to utilize a variety ot' tools, as for instance an anvil 18 may be used, having a top different than the top 20 of the anvil 18. Other changes and alterations are contemplated, as within the scope of the following claim.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is z- The combination with a base plate of an anvil block, and an anvil, a setting tool comprising a spring pressed shank movable within a recess in the block and a head on the shank, and a locking key engaging the anvil and said shank to lock the anvil in place and to prevent dislodgment of the shank.

In testimony whereof I affix my signature in presence of two witnesses.

EDVARD JOHNSON.

Witnesses CHAs. K. FINKBEINER, R. B. HUMES.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

